Fig. 3

Response of denitrification to amendments of differing nutrient stoichiometry over time (5 days—light gray, 10 days—medium gray, and 20 days—dark gray). Denitrification rates measured on Day 0 were subtracted from subsequent days assayed to establish a new baseline. Graphs separated by low (a 2 mg L⁻¹) and high (b 20 mg L⁻¹) NO₃–N availability